This study focuses on the growth and differentiation of Gram-negative Yersinia species and non-Yersinia Enterobacteriaceae using traditional and modified CIN agar. The modified agar allows for the detection of specific enzymatic activities, aiding in the differentiation of these bacterial groups.
Begin with cultures of Gram-negative Yersinia species and non-Yersinia Enterobacteriaceae.
Using sterile needle inoculators, dot the cultures onto both traditional Cefsulodin-Irgasan-Novobiocin or CIN agar and modified CIN agar.
Incubate the plates to promote bacterial growth.
Both traditional and modified CIN agars support the growth of Yersinia and non-Yersinia Enterobacteriaceae that ferment mannitol to produce acidic byproducts.
Acid production lowers the pH and triggers a color change, resulting in a characteristic red-centered colony morphology.
Modified CIN agar contains additional substrates that detect specific enzymatic activities expressed by non-Yersinia Enterobacteriaceae.
These bacteria metabolize the substrates, resulting in pH shifts or pigment production that alter the colonies' morphology.
In contrast, Yersinia species retain their characteristic red-centered appearance.
As a result, modified CIN agar enables differentiation between Yersinia species and non-Yersinia Enterobacteriaceae based on their distinct metabolic activities.
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